Feed device for hydraulic transmissions



Sept. 10, 1935.

G. L. R. J. MESSIER l FEED DEVICE FOR` HYDRAULIC TRANSMISSIONS 2 Sheets-Sheet l I a x. R. ff ma Filed Nov. 4, 1932 sept. 1o, 1935.

G. L. R. J. MEsslER FEED DEVICE FOR HYDRAULIC TRANSMISSIONS Filed Nov. v4, 1932 2 Sheets-Sheet 2 closed, since both their faces always communi cate through the oriilce' 42, and since they simplyA transmitting member, a receiving member, a pipe serve, if need be, to increase the section of the passageway open to the liquid, in one direction or the other.

For this reason, a simpler device illustrated in Fig. 4 can be employed.

The piston 30 is provided with a housingreceivinga second piston 46 subjected to the ac`- tion of two springs 41 and- 4B. This piston` 40 is capable of moving in one direction or in the other, when the hydraulic pressure, on one of its faces, exceeds a deilnite value allowing the compression of vone of the springs 41 or 4l.

This piston 4B then moves until-it comes opposite the middle of one of the grooves 49550 provided in the main piston 30, so that the liquid can then pass about the secondary piston 4l The springs 41 and 48 can have diii'erent ilexibilities, so that the pressurescorresponding to the displacements of the piston 4l in one direction or in the other can be different.

I claim:

l. A hydraulic tron comprising: a transmitting member, a receiving member, a pipe line connecting these two members and including a casing, a supply tank, said casing communlcating with the said tank. a diaphragm in this casing, an oriiice rin this diaphragm, a valve normally held open opposite this oriiice, but closing the latter as soon as the speed of a liquid iiux coming from the transmitting member reaches a deiinite value, 'a piston carried by the'rod oi'-v the said valve and perforated with a calibrated orice.

2. A hydraulic transmission comprising: a transmitting member, a receiving member, a pipe line connecting these two. members and 'includingH a casing, a supply tank, the. said casing communicating onl the one hand with the Said Pipe line and on the other hand with thesaid tank; means arranged in the said casing and acting i'or closing the communication between the said pipe line and the tank as soon as the speed of a`liquid ilux coming from the' transmitting vmember reaches a definite value, these means allowing the sa'id communication to be maintained when' they are subjected to the action ot a liquid flux coming from the receiving member.

3. A hydraulic transmission comprising: a

line connecting these two members and including a casing, a supply tank, the said casing communicating onthe one hand with the said pipe..

line and on theother handv with thesaid tank, means arranged in said by-pass conduit and acting for closing the latter as soon as the speed of a liquid flux coming from the transmitting member reaches a denite value, these means leaving the said by-pass conduit open when they are subjected to the action of a liquid flux coming from the receiving member, means increasing the section of the passageway open to the iluid for flowing back from the pipe line, on the receiving side, to the pipe` line, on the transmittingV side,

when the difference of the pressures existing in these two pipe lines reaches a denite value.

4. A hydraulic transmission comprising: a

transmitting member, a receiving member, a pipe line connecting` these two members and including a casing, a supply tank, the said casing vcommunicating on the one hand with the said pipe line and on the other hand with' the said tank,.

means arranged in said by-pass conduit and acting for closing the latter as soon as the speed of` a liquid flux coming from the transmitting member reaches a denite value, these means ing from the receiving member, means increasing 5 the section oi' the passageway open to the fluid iiowing from the pipe line, on the transmitting side, towards the pipe line, on the receiving side, when the difference of pressure existing between these two pipe lines reaches a deinite value.

5. A hydraulic transmission comprising: a `transmitting member, a receiving member, a pipe line connecting these two members and including a casing, a supply tank, the said casing com-I municating on the one hand with thev said pipe 15 line and on the other hand with the said tank, means arranged in said by-pass conduit and acting`.for closing the latter as soon as the speed of a liquid flux coming from the transmitting member reaches a deilnite value, these means leav- 20 ing the said by-passl conduit open -when they are subjected to the action oi a .liquid ilux coming from the receiving member, means increasing the section of the passageway open to the fluid for flowing back from the pipe-line, on the receiving g5 side, to the pipe line, on the transmitting side, when the diil'erence of the pressures existing in these two pipe lines reaches, a denite value, means increasing the section of the passageway open to the fluid i'or owing back from .the pipe 30 line, on the transmitting side, towards the pipe line, on the receiving side, when the diierence o! pressure between these two pipe lines reaches 'a definite value, which deflnite values for the pressures can be diil'erent. 35 6. A hydraulic traon comprising: a transmitting member, a receiving member; n pipe line connecting these two members and including a casing, a supply tank. said casing'being interposed between this tank and the said pipe line. a partition dividing this casing into two compartments, an oriiice in this partition, a valve having the said oriilce i'or seat, a piston mov` able inthe said casing and rigid with this valve,

means normally holding the valve av'ay from its u vto the transmitting member and to the'receiving 5'0 member.

7. A hydraulic transmission comprising: a transmitting member, a receiving member, a pipe line connecting these two members and including v a casing, a supply tank, said'casing being inter- 55 posed between this tank and the said pipe line.

a partition dividing this casing into two com- Dartments, an orice in this partition, a valve having the said oriilce for seat, a piston movable in the said casing and rigid with this valve, means w normally holding the valve'away from its seat; conduits i'or the passage oi' the liquid, provided in the said piston, conduit branchesissuing from the casing and located on either side of the piston, these branches respectively transmitting member and to the receiving member, a second spring valve adapted to allow, ii'- need be, the rapid return oi the liquid irom the receiver towards the transmitter.

8. A hydraulic transmission comprising: a 7o leading to the 35A compartments, oriilce in this partitiona valve having the said orifice ior'seat, a. piston movable in the said casing and rigid with this valve,

means normally holding the valve away from its scat, conduits for the passage o! the liquid, provided in the said piston, kconduit branches issuing from the casing and locatedon either side ot the piston, these branches respectively leading to the -transmitting member and to the receivlng member, m s arranged outside' the casing and snowing t e liquid to directly pass from the conduit leading to the transmitter to the conduitleading to the receiver, when the dinerence ot pressur between both faces ci the piston exceeds a enite value.

9. A hydraulic tro comprisingz. a transmitting member, a receiving member, a pipe line connecting these two members and including a casing, a supply tank, said casing being interposed between this tank and the said pipe line, a partition dividing this casing into two compartments, an prince in this partition, a valve having the said orice for a seat, a piston movable in the said casing and rigid with this valve, means for normally holding the valve away from its seat, conduits for the passage of the liquid,

provided in the said piston, conduitbr'anches .issuing from' the casing and located on either lo side oi the piston, these branches leading to the transmitting member and tovv the receiving member, respectively, a secondary piston arranged within the main piston, two springs acting on eltherside of this secondary piston, and grooves .15

provided in the main piston opposite the sone o! displacement of the secondary piston.

GEORGE noms REN JEAN L 

